2200 EFI High idle adjustment

Is there a way to adjust the cold start high idle on a B2200 EFI? I know you can adjust the base idle speed.

Here is what is happening. I took the engine out of my 93 B2200 with all sensors on the motor intact, I put the engine into my dads 92 B2200 EFI (both factory EFI) left all sensors and manifolds untouched, now on these cold days it sounds like it revs higher than it did when it was in my truck, but it also cuts the fuel or spark for a second to bring the revs down, then kicks back on, revs up, kicks out spark/fuel, etc... it does this 2 or 3 times untill the idle speed lowers slightly, then it runs smoothly, and after 5 minutes settles down to a ~750RPM. No adjustments were made to the throttle body or distributor. I should note this only happens on cold starts, usually only first thing in the morning, and only when it is -20C or colder, or 0F or colder. The idle control circuit is working correctly, as the revs go down to normal idle speed as the engine warms up.

Does the engine run normally otherwise?
How high is the idle speed initially at those cold temps?

Your idle air control valve has two passages for air. One is completely automatic and slowly closes as the coolant temp rises to operating temperature. It sounds like this portion of the IAC is working properly since it steadily slows to 750 RPM.

The other side of the IAC adds extra air at the direction of the ECM... normally while driving. However, it may be malfunctioning or just not operating smoothly... just adding some additional air due to the extreme cold.

I'm guessing the high idle is probably normal. As for the couple of surges, it might be the ECM controlled portion of the IAC. You might try jumping the green test connector (under the wiper motor) to ground before you start it next time. This should (I'm not certain) prevent the ECM from modulating that portion of the IAC valve. If it doesn't do the surge thing, then that is probably the source of your problem. It may even lower your idle speed a little bit. However, leaving the test connecter grounded is not a solution to your idle and you shouldn't drive it that way since you won't be getting the proper spark advance.

I dont have a tach on this truck, when the engine was in my 93, it had a max cold idle speed of 2500 when started in these temps, it sounds like it is reving faster in this truck. The surging sounds like someone turns the ignition off for a second then turns it back on. I wonder if its the ecu? Maybe its opening the valve too much? Other than that the engine runs great, good fuel mileage, starts fine, etc...

It sounds like you have a vacuum leak, look for broken or missing hoses.

I just wanted to put this out there. I have a '92 EFI B2200 and I have a surging sensation only when cold, when I apply a load (mostly at throttle tip in) it does the same thing as your surging, even while gassing into the next gear. Exactly as you explained, like it shut the ignition off for a second. I have been searching for the solution for years now, IAC is operating properly, ECU has no leaky caps, MAF is good, TPS is calibrated, Coil is in spec, I have replaced all the vacuum lines when I rebuilt it 35,xxx miles ago etc, etc. (same issue before the rebuild, in fact this has always been happening through the 10 years I have owned it)

I just adjust my driving style when its cold. I have to slowly tip in on the throttle and it seems to work fine with no hesitation, once it warms up its fine.

Oh and high idle only when cold or at high altitude. On start up when cold it kisses 2500 rpm and slowly decreases to about 1000 RPM until its warm then it sits at 750 or so.

If you figure it out please let me know!

Edit: mine doesn't surge during start up though, it slowly and smoothly drops down as it warms. My surging is when I give it gas on a cold engine.

Im at high altitude ish (2000 ft) and cold. My dad thought it was hitting a rev limiter. It has to be something on not attached to the motor since it never did this in my 93. Air flow sensor, coil, ecu, whatever sensors are beside coil are all new to this engine. I think its the ecu, might be programmed slightly different than my 93?

Well if you try grounding the test connecter and/or unplugging the IAC connecter, then that should take the ECM and that side of the IAC out of the equation.